The chief of staff for Queensland Premier Anna Bligh has become the latest Labor figure to become embroiled in the controversy over business links to the State Government.

Local Government Minister Desley Boyle and Planning Minister Stirling Hinchliffe reportedly did not reveal they had met about the Inskip Point development in south-east Queensland in 2005, before Mr Hinchliffe was elected.

It has now been revealed the Premier's chief of staff, Mike Kaiser, also acted on behalf of the developer in 2005.

Ms Bligh says her two ministers did nothing wrong and Mr Hinchliffe will have nothing to do with the final decision on the resort.

"In this case, Minister Boyle met with the owners of this land and they were accompanied by Mr Hinchliffe," Ms Bligh said.

"She also met with the council and she also met with the residents who are opposed to the development.

"That is a very normal part of government and every minister I expect to talk to all players and to determine their own view based on the best way forward."

"This company has received no advantage from this Government whatsoever," Mr Fraser said.

"[Mr Kaiser] properly declared his previous involvement at the time of commencing his employment with the Government.

"This is matter that occurred more than four years ago - the cooling-off period that's in place is two years.

"This is matter that occurred in the past - has been properly declared.

"The key point - this company has received no advantage from Government and it has all been properly declared."

LNP billboards

Meanwhile, the State Government and the Opposition are in a dispute about approval for billboards promoting LNP Leader John-Paul Langbroek.

Fifteen of the billboards, which promote Mr Langbroek but do not mention LNP, will be erected around Brisbane.

Mr Langbroek says officers in the Premier's Department have authorised the expenditure of money from his budget, but Mr Fraser says the money has not been approved.

Mr Fraser says they are blatant political advertising and an abuse of taxpayer funds.

He says the LNP should foot the $100,000 bill.

"Mr Langbroek is asserting that they are being paid for out of his entitlements to run the Leader of the Opposition's office, but taxpayers are meeting the cost of these blatantly political billboards," he said.

"He's says that they have been approved, they are outside the guidelines [but] they haven't been approved and they won't be approved."

Mr Langbroek says the billboards are a legitimate way to tell people about him and an alternative LNP government.

"I clearly would want to make sure I'm doing the right thing, unlike this Labor Government," he said.

"I can tell you I'm confident - I know that these have been approved by the Premier's own department."